Legend:

* `aeson-0.6.2` currently depends on `blaze-builder` which is not in the platform. There's a [https://github.com/bos/aeson/pull/143 pull request] for using the `Builder` from `bytestring` >= 0.10.

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* `aeson-0.6.2` currently depends on `blaze-builder` which is not in the platform. Fortunately `aeson` HEAD is now using the `Builder` from `bytestring` >= 0.10 (it can still use older versions of `bytestring` by configuring `aeson` with `-fblaze-builder`).